Description
Technical Specifications
- Model Series: ACN CS D2014 Special Analog Acquisition Subseries
- Power Supply: 24 VDC ±10, rated power consumption 10.5 W
- RTD Input Channels: 8 three-wire isolated RTD channels
- Supported Sensor Types: PT100, PT1000 configurable per channel
- Temperature Measurement Range: -200 °C ~ +850 °C
- Signal Resolution: 16-bit high-precision ADC conversion
- Backplane Bus: Metso proprietary ACN high-speed internal bus
- Operating Temperature: -20 °C ~ +60 °C
- Storage Temperature: -40 °C ~ +85 °C
- Humidity Tolerance: 5%–95% non-condensing
- Protection Grade: IP20 module body, IP54 full rack assembly
- Dimension: 220 H × 160 W × 35 D mm
- Net Weight: 0.74 kg
Functional Features
- 8 independent three-wire RTD acquisition channels with full isolation
- Automatic wire resistance compensation for three-wire RTD cable length deviation
- Per-channel RTD sensor open/short circuit fault self-diagnosis
- Front panel independent LED over-temperature alarm indicator for each channel
- Onboard Flash memory stores RTD linear calibration parameters
- Full hot-swap compatible with ACN CS rack backplane
- Automatic PT100/PT1000 sensor type identification without manual configuration
Performance Parameters
- Temperature Measurement Accuracy: ±0.08 °C full scale
- Channel Isolation Voltage: 1500 VAC channel to backplane bus
- ADC Conversion Cycle Time: 0.9 ms per channel
- Surge Withstand Capacity: 2 kV ESD contact discharge, 4 kV EFT
- Vibration Resistance: 10–150 Hz, 1 g continuous operation
- Max RTD Cable Length: 150 m shielded three-wire cable
Material Composition
- PCB Substrate: FR4 high-Tg low-drift industrial fiberglass circuit board
- Signal Terminals: Gold-plated phosphor bronze anti-corrosion terminal blocks
- Reference Resistance: Ultra-low temperature drift precision metal film resistors
- Shield Frame: Single-layer cold-rolled steel signal isolation shielding
- Mounting Housing: Black extruded aluminum alloy hard anodized anti-corrosion coating
Structural Characteristics
- Standard 1U dual-latch plug-in rack card structure
- Front panel 8-group independent LED fault indicator array corresponding to each RTD channel
- Rear gold finger connector docking with rack backplane bus
- Independent wiring terminal compartment for three-wire RTD sensor cable access
- Double isolation barrier between RTD analog circuit and digital bus circuit
Working Principle
Three-wire RTD resistance signals enter isolated signal conditioning circuits; internal precision reference resistors automatically compensate cable wire resistance error. Resistance value converts to digital temperature data via 16-bit ADC chips, linear correction executed according to stored RTD characteristic curves, temperature data transmits to rack main controller via ACN backplane bus. Hardware circuits continuously detect open-circuit and short-circuit faults of RTD sensor cables and trigger corresponding front panel alarm LED signals.
Advantage Highlights
- Automatic three-wire cable resistance compensation eliminates wiring length measurement error
- Auto-recognition of PT100/PT1000 sensors reduces on-site configuration workload
- Ultra-low drift precision reference resistors guarantee long-term stable temperature measurement
- Per-channel independent fault diagnosis quickly locates damaged RTD sensors
- Hot-swap maintenance without full rack power shutdown
- Factory pre-calibrated RTD characteristic curves without on-site calibration
Applicable Industries
- Pulp mill process water, slurry medium temperature monitoring
- Chemical reactor low-medium temperature closed-loop control
- Municipal wastewater treatment pool temperature collection
- Mining thickener overflow slurry temperature monitoring
- Food & pharmaceutical production line constant temperature workshop monitoring
Installation Requirements
- Install inside standard Metso ACN CS 8/16-slot control rack
- Maintain 10 mm vertical ventilation gap between adjacent modules
- RTD field wiring uses dedicated three-wire shielded platinum resistance cable
- Cabinet PE grounding resistance ≤ 4 Ω to suppress external signal interference
- Stabilize rack backplane 24 VDC power before hot-swapping modules
- Control cabinet internal continuous operating temperature below 55 °C
Operation & Maintenance Precautions
- ESD anti-static wrist strap mandatory during module disassembly and wiring
- Avoid mixing RTD cables with power cables inside cabinet wiring channels
- Conduct semi-annual inspection of terminal block screw tightness
- Do not install adjacent to high-power frequency converter modules
- Spare modules stored in sealed anti-static packaging with desiccant packs
- Cut off field RTD sensor wiring terminals before disassembling terminal blocks
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